// ============================================================================
//
// Copyright (C) 2006-2007 Dengues
//
// Google Group: http://groups.google.com/group/dengues
//
// QQ Group: 24885404
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// ============================================================================
package org.dengues.designer.ui.process.commands;

import org.dengues.core.external.AbstractCompNodeExt;
import org.dengues.designer.ui.editors.AbstractGEFCommand;
import org.dengues.designer.ui.process.models.CompNode;

/**
 * Qiang.Zhang.Adolf@gmail.com class global comment. Detailled comment <br/>
 * 
 * $Id: Dengues.epf Qiang.Zhang.Adolf@gmail.com 2008-6-13 qiang.zhang $
 * 
 */
public class ExternalNodeChangeDataCommand extends AbstractGEFCommand {

    private final CompNode compNode;

    private final AbstractCompNodeExt externalNode;

    private String oldValue;

    /**
     * Qiang.Zhang.Adolf@gmail.com ChangeExternalNodeDataCommand constructor comment.
     * 
     * @param externalNode
     * @param compNode
     */
    public ExternalNodeChangeDataCommand(CompNode compNode, AbstractCompNodeExt externalNode) {
        this.compNode = compNode;
        this.element = compNode;
        this.externalNode = externalNode;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.dengues.designer.ui.editors.AbstractGEFCommand#execute()
     */
    @Override
    public void execute() {
        String sData = externalNode.getStringData();
        if (sData != null) {
            oldValue = sData;
            compNode.setStringData(sData);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.dengues.designer.ui.editors.AbstractGEFCommand#undo()
     */
    @Override
    public void undo() {
        compNode.setStringData(oldValue);
    }

}
